/* =========================
   Programming Lab - Bitbucket
   Theme: Atlassian-ish Navy
========================= */
:root{
  --bg: #f5f7fb;
  --card: rgba(255,255,255,.92);
  --text: #0f172a;
  --muted: #64748b;

  --primary: #1e3a8a;       /* Navy */
  --primary2:#2563eb;       /* Blue */
  --accent: #38bdf8;        /* Sky */
  --good: #16a34a;
  --warn: #f59e0b;

  --border: rgba(148,163,184,.28);
  --shadow: 0 18px 50px rgba(2, 6, 23, .10);
  --radius: 16px;

  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

[data-theme="dark"]{
  --bg: #0b1220;
  --card: rgba(15,23,42,.72);
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: rgba(148,163,184,.18);
  --shadow: 0 22px 60px rgba(0,0,0,.35);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  font-family: "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  background:
    radial-gradient(900px 500px at 15% 10%, rgba(56,189,248,.22), transparent 60%),
    radial-gradient(900px 500px at 80% 0%, rgba(37,99,235,.18), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
}

a{ color: inherit; }
code{
  font-family: var(--mono);
  font-size: .95em;
  padding: .1em .35em;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(148,163,184,.12);
}
pre code{
  padding: 0;
  border: 0;
  background: transparent;
}

.wrap{
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* =========================
   Header
========================= */
.site-header{
  padding: 2.3rem 0 1.5rem;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(30,58,138,.96), rgba(37,99,235,.92));
  border-bottom: 1px solid rgba(255,255,255,.16);
}

.badge{
  display: inline-flex;
  gap: .5rem;
  align-items: center;
  padding: .35rem .65rem;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.18);
  font-size: .85rem;
}

.site-header h1{
  margin: .65rem 0 .2rem;
  font-size: clamp(1.55rem, 2.5vw, 2.2rem);
  letter-spacing: .02em;
}

.lead{
  margin: 0 0 .9rem;
  color: rgba(255,255,255,.86);
  max-width: 72ch;
}

.breadcrumb{
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  align-items: center;
  margin-top: .3rem;
  color: rgba(255,255,255,.86);
  font-size: .92rem;
}
.breadcrumb a{
  text-decoration: none;
  padding: .15rem .35rem;
  border-radius: 10px;
}
.breadcrumb a:hover{
  background: rgba(255,255,255,.12);
}
.sep{ opacity: .75; }

.hero-actions{
  margin-top: 1rem;
  display: flex;
  gap: .65rem;
  flex-wrap: wrap;
}

.btn{
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(255,255,255,.10);
  color: #fff;
  padding: .55rem .9rem;
  border-radius: 999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  cursor: pointer;
  user-select: none;
  transition: transform .08s ease, background .18s ease, border-color .18s ease;
}
.btn:hover{ background: rgba(255,255,255,.16); }
.btn:active{ transform: translateY(1px); }
.btn.primary{
  background: rgba(56,189,248,.22);
  border-color: rgba(56,189,248,.35);
}
.btn.ghost{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.20);
}

.meta{
  margin-top: 1rem;
  display:flex;
  flex-wrap: wrap;
  gap:.5rem;
  align-items:center;
  color: rgba(255,255,255,.78);
  font-size: .9rem;
}
.dot{ opacity: .8; }

/* =========================
   Layout
========================= */
.layout{
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1rem;
  margin: 1.2rem auto 2rem;
}

@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
}

/* =========================
   Side
========================= */
.side{
  position: sticky;
  top: 1rem;
  align-self: start;
}
@media (max-width: 980px){
  .side{ position: static; }
}

.side-card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.side-title{
  padding: .9rem 1rem;
  font-weight: 900;
  letter-spacing: .04em;
  background: linear-gradient(135deg, rgba(37,99,235,.12), rgba(56,189,248,.10));
  border-bottom: 1px solid var(--border);
}

.toc{
  padding: .7rem .9rem .2rem;
}
.toc a{
  display:block;
  text-decoration: none;
  padding: .4rem .55rem;
  border-radius: 12px;
  color: var(--text);
  border: 1px solid transparent;
}
.toc a:hover{
  background: rgba(148,163,184,.12);
  border-color: var(--border);
}
.toc a small{
  color: var(--muted);
  margin-left: .35rem;
}

.side-tools{
  padding: .6rem .9rem .9rem;
  display:flex;
  gap:.5rem;
  border-top: 1px solid var(--border);
}

.mini{
  flex:1;
  padding: .48rem .6rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(148,163,184,.10);
  color: var(--text);
  cursor: pointer;
}
.mini:hover{ background: rgba(148,163,184,.14); }

.side-note{
  padding: .9rem 1rem 1rem;
  border-top: 1px solid var(--border);
}
.note-title{
  margin: 0 0 .35rem;
  font-weight: 800;
}
.side-note ul{
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

/* =========================
   Cards
========================= */
.content{ min-width: 0; }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.2rem 1.2rem;
  margin-bottom: 1rem;
}

.card h2{
  margin: 0 0 .6rem;
  font-size: 1.35rem;
  letter-spacing: .02em;
}
.hgroup .sub{ margin-top: -.2rem; color: var(--muted); }

.subtle{ color: var(--muted); margin: .6rem 0 0; }

.callouts{
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .75rem;
}
@media (max-width: 980px){
  .callouts{ grid-template-columns: 1fr; }
}

.callout{
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(148,163,184,.08);
  padding: .75rem .8rem;
}
.callout .k{
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: .15rem;
}
.callout .v{
  font-weight: 700;
}
.callout.wide{
  display:grid;
  grid-template-columns: 90px 1fr;
  gap:.7rem;
  align-items: start;
}

.hint{
  margin-top: 1rem;
  padding: .85rem .9rem;
  border-radius: 14px;
  border: 1px solid rgba(56,189,248,.35);
  background: rgba(56,189,248,.12);
}

/* =========================
   Lists
========================= */
.check{
  margin: .5rem 0 0;
  padding-left: 1.15rem;
}
.check li{ margin: .25rem 0; }
.steps{
  margin: .4rem 0 0;
  padding-left: 1.1rem;
}
.steps li{ margin: .35rem 0; }

/* =========================
   Panels / Grid
========================= */
.grid2{
  margin-top: 1rem;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}
@media (max-width: 980px){
  .grid2{ grid-template-columns: 1fr; }
}
.panel{
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: .9rem .95rem;
  background: rgba(148,163,184,.08);
}
.panel h3{
  margin: 0 0 .4rem;
  font-size: 1.05rem;
}

/* =========================
   Tables
========================= */
.table-wrap{
  overflow:auto;
  border-radius: 14px;
  border: 1px solid var(--border);
  margin-top: .9rem;
}
.table{
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}
.table th, .table td{
  padding: .8rem .85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.table thead th{
  background: rgba(37,99,235,.10);
  font-weight: 900;
}
.table tbody tr:hover{
  background: rgba(148,163,184,.08);
}

/* =========================
   Tabs
========================= */
.tabs{
  margin-top: .8rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.tablist{
  display:flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: .7rem .7rem;
  border-bottom: 1px solid var(--border);
  background: rgba(148,163,184,.07);
}
.tab{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.0);
  color: var(--text);
  padding: .45rem .75rem;
  border-radius: 999px;
  cursor: pointer;
}
.tab[aria-selected="true"]{
  background: rgba(37,99,235,.14);
  border-color: rgba(37,99,235,.35);
  font-weight: 800;
}
.tabpanel{
  padding: .95rem .95rem 1rem;
}
.mini-note{
  margin-top: .8rem;
  color: var(--muted);
}

/* =========================
   Code box + Copy
========================= */
.codebox{
  margin-top: .8rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow:hidden;
}
.codehead{
  display:flex;
  justify-content: space-between;
  gap: .8rem;
  align-items: center;
  padding: .55rem .7rem;
  background: rgba(2, 6, 23, .05);
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .codehead{
  background: rgba(0,0,0,.18);
}
.codehead span{
  color: var(--muted);
  font-size: .9rem;
}
.copy{
  border: 1px solid var(--border);
  background: rgba(148,163,184,.12);
  color: var(--text);
  border-radius: 12px;
  padding: .4rem .6rem;
  cursor:pointer;
}
.copy:hover{ background: rgba(148,163,184,.18); }

.codebox pre{
  margin:0;
  padding: .85rem .9rem 1rem;
  overflow:auto;
  font-family: var(--mono);
  font-size: .92rem;
}

/* =========================
   Accordion
========================= */
.accordion{
  margin-top: .4rem;
  display:grid;
  gap: .6rem;
}
details{
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(148,163,184,.08);
  overflow:hidden;
}
summary{
  cursor:pointer;
  padding: .8rem .9rem;
  font-weight: 900;
  list-style: none;
}
summary::-webkit-details-marker{ display:none; }
summary:after{
  content:"＋";
  float:right;
  opacity:.75;
}
details[open] summary:after{ content:"－"; }
.detail{
  padding: .1rem .9rem .9rem;
  color: var(--text);
}

/* =========================
   Footer
========================= */
.footer{
  margin: 1.2rem 0 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(148,163,184,.08);
  color: var(--muted);
}
.footer a{ color: inherit; text-decoration: none; }
.footer a:hover{ text-decoration: underline; }